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[/] [test_project/] [trunk/] [linux_sd_driver/] [net/] [x25/] [x25_timer.c] - Blame information for rev 62

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/*
 *      X.25 Packet Layer release 002
 *
 *      This is ALPHA test software. This code may break your machine,
 *      randomly fail to work with new releases, misbehave and/or generally
 *      screw up. It might even work.
 *
 *      This code REQUIRES 2.1.15 or higher
 *
 *      This module:
 *              This module is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 *      History
 *      X.25 001        Jonathan Naylor Started coding.
 *      X.25 002        Jonathan Naylor New timer architecture.
 *                                      Centralised disconnection processing.
 */
 
#include <linux/errno.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <net/x25.h>
 
static void x25_heartbeat_expiry(unsigned long);
static void x25_timer_expiry(unsigned long);
 
void x25_init_timers(struct sock *sk)
{
        struct x25_sock *x25 = x25_sk(sk);
 
        init_timer(&x25->timer);
        x25->timer.data     = (unsigned long)sk;
        x25->timer.function = &x25_timer_expiry;
 
        /* initialized by sock_init_data */
        sk->sk_timer.data     = (unsigned long)sk;
        sk->sk_timer.function = &x25_heartbeat_expiry;
}
 
void x25_start_heartbeat(struct sock *sk)
{
        mod_timer(&sk->sk_timer, jiffies + 5 * HZ);
}
 
void x25_stop_heartbeat(struct sock *sk)
{
        del_timer(&sk->sk_timer);
}
 
void x25_start_t2timer(struct sock *sk)
{
        struct x25_sock *x25 = x25_sk(sk);
 
        mod_timer(&x25->timer, jiffies + x25->t2);
}
 
void x25_start_t21timer(struct sock *sk)
{
        struct x25_sock *x25 = x25_sk(sk);
 
        mod_timer(&x25->timer, jiffies + x25->t21);
}
 
void x25_start_t22timer(struct sock *sk)
{
        struct x25_sock *x25 = x25_sk(sk);
 
        mod_timer(&x25->timer, jiffies + x25->t22);
}
 
void x25_start_t23timer(struct sock *sk)
{
        struct x25_sock *x25 = x25_sk(sk);
 
        mod_timer(&x25->timer, jiffies + x25->t23);
}
 
void x25_stop_timer(struct sock *sk)
{
        del_timer(&x25_sk(sk)->timer);
}
 
unsigned long x25_display_timer(struct sock *sk)
{
        struct x25_sock *x25 = x25_sk(sk);
 
        if (!timer_pending(&x25->timer))
                return 0;
 
        return x25->timer.expires - jiffies;
}
 
static void x25_heartbeat_expiry(unsigned long param)
{
        struct sock *sk = (struct sock *)param;
 
        bh_lock_sock(sk);
        if (sock_owned_by_user(sk)) /* can currently only occur in state 3 */
                goto restart_heartbeat;
 
        switch (x25_sk(sk)->state) {
 
                case X25_STATE_0:
                        /*
                         * Magic here: If we listen() and a new link dies
                         * before it is accepted() it isn't 'dead' so doesn't
                         * get removed.
                         */
                        if (sock_flag(sk, SOCK_DESTROY) ||
                            (sk->sk_state == TCP_LISTEN &&
                             sock_flag(sk, SOCK_DEAD))) {
                                bh_unlock_sock(sk);
                                x25_destroy_socket(sk);
                                return;
                        }
                        break;
 
                case X25_STATE_3:
                        /*
                         * Check for the state of the receive buffer.
                         */
                        x25_check_rbuf(sk);
                        break;
        }
restart_heartbeat:
        x25_start_heartbeat(sk);
        bh_unlock_sock(sk);
}
 
/*
 *      Timer has expired, it may have been T2, T21, T22, or T23. We can tell
 *      by the state machine state.
 */
static inline void x25_do_timer_expiry(struct sock * sk)
{
        struct x25_sock *x25 = x25_sk(sk);
 
        switch (x25->state) {
 
                case X25_STATE_3:       /* T2 */
                        if (x25->condition & X25_COND_ACK_PENDING) {
                                x25->condition &= ~X25_COND_ACK_PENDING;
                                x25_enquiry_response(sk);
                        }
                        break;
 
                case X25_STATE_1:       /* T21 */
                case X25_STATE_4:       /* T22 */
                        x25_write_internal(sk, X25_CLEAR_REQUEST);
                        x25->state = X25_STATE_2;
                        x25_start_t23timer(sk);
                        break;
 
                case X25_STATE_2:       /* T23 */
                        x25_disconnect(sk, ETIMEDOUT, 0, 0);
                        break;
        }
}
 
static void x25_timer_expiry(unsigned long param)
{
        struct sock *sk = (struct sock *)param;
 
        bh_lock_sock(sk);
        if (sock_owned_by_user(sk)) { /* can currently only occur in state 3 */
                if (x25_sk(sk)->state == X25_STATE_3)
                        x25_start_t2timer(sk);
        } else
                x25_do_timer_expiry(sk);
        bh_unlock_sock(sk);
}

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`* X.25 Packet Layer release 002`
3			`*`
4			`* This is ALPHA test software. This code may break your machine,`
5			`* randomly fail to work with new releases, misbehave and/or generally`
6			`* screw up. It might even work.`
7			`*`
8			`* This code REQUIRES 2.1.15 or higher`
9			`*`
10			`* This module:`
11			`* This module is free software; you can redistribute it and/or`
12			`* modify it under the terms of the GNU General Public License`
13			`* as published by the Free Software Foundation; either version`
14			`* 2 of the License, or (at your option) any later version.`
15			`*`
16			`* History`
17			`* X.25 001 Jonathan Naylor Started coding.`
18			`* X.25 002 Jonathan Naylor New timer architecture.`
19			`* Centralised disconnection processing.`
20			`*/`
21
22			`#include <linux/errno.h>`
23			`#include <linux/jiffies.h>`
24			`#include <linux/timer.h>`
25			`#include <net/sock.h>`
26			`#include <net/tcp_states.h>`
27			`#include <net/x25.h>`
28
29			`static void x25_heartbeat_expiry(unsigned long);`
30			`static void x25_timer_expiry(unsigned long);`
31
32			`void x25_init_timers(struct sock *sk)`
33			`{`
34			`struct x25_sock *x25 = x25_sk(sk);`
35
36			`init_timer(&x25->timer);`
37			`x25->timer.data = (unsigned long)sk;`
38			`x25->timer.function = &x25_timer_expiry;`
39
40			`/* initialized by sock_init_data */`
41			`sk->sk_timer.data = (unsigned long)sk;`
42			`sk->sk_timer.function = &x25_heartbeat_expiry;`
43			`}`
44
45			`void x25_start_heartbeat(struct sock *sk)`
46			`{`
47			`mod_timer(&sk->sk_timer, jiffies + 5 * HZ);`
48			`}`
49
50			`void x25_stop_heartbeat(struct sock *sk)`
51			`{`
52			`del_timer(&sk->sk_timer);`
53			`}`
54
55			`void x25_start_t2timer(struct sock *sk)`
56			`{`
57			`struct x25_sock *x25 = x25_sk(sk);`
58
59			`mod_timer(&x25->timer, jiffies + x25->t2);`
60			`}`
61
62			`void x25_start_t21timer(struct sock *sk)`
63			`{`
64			`struct x25_sock *x25 = x25_sk(sk);`
65
66			`mod_timer(&x25->timer, jiffies + x25->t21);`
67			`}`
68
69			`void x25_start_t22timer(struct sock *sk)`
70			`{`
71			`struct x25_sock *x25 = x25_sk(sk);`
72
73			`mod_timer(&x25->timer, jiffies + x25->t22);`
74			`}`
75
76			`void x25_start_t23timer(struct sock *sk)`
77			`{`
78			`struct x25_sock *x25 = x25_sk(sk);`
79
80			`mod_timer(&x25->timer, jiffies + x25->t23);`
81			`}`
82
83			`void x25_stop_timer(struct sock *sk)`
84			`{`
85			`del_timer(&x25_sk(sk)->timer);`
86			`}`
87
88			`unsigned long x25_display_timer(struct sock *sk)`
89			`{`
90			`struct x25_sock *x25 = x25_sk(sk);`
91
92			`if (!timer_pending(&x25->timer))`
93			`return 0;`
94
95			`return x25->timer.expires - jiffies;`
96			`}`
97
98			`static void x25_heartbeat_expiry(unsigned long param)`
99			`{`
100			`struct sock sk = (struct sock )param;`
101
102			`bh_lock_sock(sk);`
103			`if (sock_owned_by_user(sk)) /* can currently only occur in state 3 */`
104			`goto restart_heartbeat;`
105
106			`switch (x25_sk(sk)->state) {`
107
108			`case X25_STATE_0:`
109			`/*`
110			`* Magic here: If we listen() and a new link dies`
111			`* before it is accepted() it isn't 'dead' so doesn't`
112			`* get removed.`
113			`*/`
114			`if (sock_flag(sk, SOCK_DESTROY) \|\|`
115			`(sk->sk_state == TCP_LISTEN &&`
116			`sock_flag(sk, SOCK_DEAD))) {`
117			`bh_unlock_sock(sk);`
118			`x25_destroy_socket(sk);`
119			`return;`
120			`}`
121			`break;`
122
123			`case X25_STATE_3:`
124			`/*`
125			`* Check for the state of the receive buffer.`
126			`*/`
127			`x25_check_rbuf(sk);`
128			`break;`
129			`}`
130			`restart_heartbeat:`
131			`x25_start_heartbeat(sk);`
132			`bh_unlock_sock(sk);`
133			`}`
134
135			`/*`
136			`* Timer has expired, it may have been T2, T21, T22, or T23. We can tell`
137			`* by the state machine state.`
138			`*/`
139			`static inline void x25_do_timer_expiry(struct sock * sk)`
140			`{`
141			`struct x25_sock *x25 = x25_sk(sk);`
142
143			`switch (x25->state) {`
144
145			`case X25_STATE_3: /* T2 */`
146			`if (x25->condition & X25_COND_ACK_PENDING) {`
147			`x25->condition &= ~X25_COND_ACK_PENDING;`
148			`x25_enquiry_response(sk);`
149			`}`
150			`break;`
151
152			`case X25_STATE_1: /* T21 */`
153			`case X25_STATE_4: /* T22 */`
154			`x25_write_internal(sk, X25_CLEAR_REQUEST);`
155			`x25->state = X25_STATE_2;`
156			`x25_start_t23timer(sk);`
157			`break;`
158
159			`case X25_STATE_2: /* T23 */`
160			`x25_disconnect(sk, ETIMEDOUT, 0, 0);`
161			`break;`
162			`}`
163			`}`
164
165			`static void x25_timer_expiry(unsigned long param)`
166			`{`
167			`struct sock sk = (struct sock )param;`
168
169			`bh_lock_sock(sk);`
170			`if (sock_owned_by_user(sk)) { /* can currently only occur in state 3 */`
171			`if (x25_sk(sk)->state == X25_STATE_3)`
172			`x25_start_t2timer(sk);`
173			`} else`
174			`x25_do_timer_expiry(sk);`
175			`bh_unlock_sock(sk);`
176			`}`

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[/] [test_project/] [trunk/] [linux_sd_driver/] [net/] [x25/] [x25_timer.c] - Blame information for rev 62